── ── Cognitive bias

Narrative Fallacy

The narrative fallacy is the tendency to construct retrospective causal stories that make past events seem inevitable — even when those events were largely random or contingent. Named by Nassim Taleb (The Black Swan, 2007, ch. 6); grounded in Kahneman's "illusion of understanding" (Thinking, Fast and Slow, 2011, ch. 19). Three structural drivers: causal hunger (brains auto-infer causation from sequence)…

How it works

Step 1 — Identify the narrative: story / outcome explained / causes identified / implied lesson. Step 2 — Test selection bias: how many comparable attempts didn't produce this outcome? Would the same narrative-construction method explain their failure equally well? If yes, the narratives are post-hoc, not causal. Step 3 — Reconstruct pre-event uncertainty: what did contemporaneous documents actually say? What were the plausible alternative outcomes? How much of the "obvious cause" was visible in advance? Step 4 — Test counterfactuals: if the identified cause had been absent, would the outcome still have occurred? What chance events could plausibly have changed it? Step 5 — Probabilistic re-expression: replace "X happened because Y" with "X happened; Y likely contributed; here's the evidence; here's what we don't know; here's my confidence." Step 6 — Document lessons cautiously: what is the actual transferable insight (vs. narrative-coloration)? What's the evidence base across cases beyond the focal one?

When to use it

• user is reading a business case study or founder biography and drawing lessons
• a post-mortem produced a neat single root cause
• someone says 'the story is too clean' or 'that explanation is too convenient'
• a pundit explains a market or political event confidently after it happened
• user is building a strategy based on what worked at another company

Worked example

"AI Changes Everything" vs. Measured Enterprise ROI (2023–2026)

Between the November 2022 launch of ChatGPT and early 2026, a single, clean, causal-sounding story swept boardrooms, markets, and media: generative AI changes everything, and every company must adopt it now or be disrupted. This walkthrough applies the skill's six-step Process to that narrative — not to argue AI is unimportant, but to separate the story from what was actually measured.

Related mental models